What is a rodding eye chamber?
A rodding eye chamber — in Dutch ontstoppingsput — is the last chamber on a building’s connection to the public sewer, sited just inside the property boundary. It provides access to inspect and clear the connection, and it marks the division between the private and the public part of the drainage.
The chamber therefore has two functions at once: a technical one and a legal one. Technically it is the access point through which a drain clearance operative feeds a rod or a high-pressure jet into the pipework. Legally, in many local connection by-laws, it is the point that decides responsibility: the length towards the building belongs to the owner, the length towards the street usually to the local authority.
Where it is and how to recognise it
- Usually in the front garden, roughly half a metre inside the boundary.
- Depth varies with local practice and site conditions; broadly between 0.8 and 1.4 metres below ground level.
- It has a cover on top, often a square or round chamber in concrete or plastic. In older properties the cover has sometimes been paved or planted over.
- The exact position is almost always recorded on the drainage connection drawing held by the local authority, which can be requested.
Practical advice
- Keep it accessible. Do not pave or tile over it and do not put a shed or a planter on top. When there is a blockage, a chamber that first has to be dug up is expensive and slow.
- Mark the position when you relandscape the garden, for example with a contrasting slab or a cover set flush with the ground.
- Establish responsibility first when a blockage occurs. Many authorities will check free of charge whether the blockage lies in the public section. If it lies on the building side, the owner bears the cost.
- Check when buying a property whether the chamber is present and reachable; in older buildings it is regularly missing.
Related terms
- Soil vent pipe
- Land drainage
- Ground level
- Fall (gradient)
- Drain connection
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